ebiten/ebitenutil/file_js.go

66 lines
1.6 KiB
Go
Raw Normal View History

2015-01-02 08:48:07 +01:00
// Copyright 2015 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
2015-01-02 08:48:07 +01:00
// +build js
package ebitenutil
import (
2015-01-02 08:48:07 +01:00
"bytes"
"errors"
"fmt"
2016-03-06 17:29:12 +01:00
2018-05-24 18:23:09 +02:00
"github.com/hajimehoshi/gopherwasm/js"
)
2016-03-06 17:29:12 +01:00
type file struct {
*bytes.Reader
}
func (f *file) Close() error {
return nil
}
func OpenFile(path string) (ReadSeekCloser, error) {
2015-01-02 08:48:07 +01:00
var err error
2018-05-24 18:23:09 +02:00
var content js.Value
2015-01-02 08:48:07 +01:00
ch := make(chan struct{})
req := js.Global.Get("XMLHttpRequest").New()
req.Call("open", "GET", path, true)
req.Set("responseType", "arraybuffer")
req.Call("addEventListener", "load", func() {
2015-01-02 08:48:07 +01:00
defer close(ch)
status := req.Get("status").Int()
if 200 <= status && status < 400 {
content = req.Get("response")
return
}
err = errors.New(fmt.Sprintf("http error: %d", status))
})
req.Call("addEventListener", "error", func() {
2015-01-02 08:48:07 +01:00
defer close(ch)
err = errors.New(fmt.Sprintf("XMLHttpRequest error: %s", req.Get("statusText").String()))
2015-01-02 08:48:07 +01:00
})
req.Call("send")
<-ch
if err != nil {
2016-03-06 17:29:12 +01:00
return nil, err
}
2015-01-02 08:48:07 +01:00
2018-05-24 18:23:09 +02:00
var data []byte
js.ValueOf(data).Call("set", content)
2016-03-06 17:29:12 +01:00
f := &file{bytes.NewReader(data)}
return f, nil
}